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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42829ca8e9dc91fb8f8f62646f244bd3a081e077f509f0f7f6bc96d9c30348e2' 
  AND token = 'Tc44voNMi7efPqeHMH2Eo8rrSzLLqkTK4ROBaW8Q9u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}