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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec42a4dabb1f35eb08691ca4bf3eb10c5e2cfdb43830f8a0f4acd870e595e3c' 
  AND token = 'VZIWfchE8lFcN7IJkYsae8kn7Nbz2HBVQH2l037Rm1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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