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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4f98a63fc378f84eba615de150297912a1b6860dd3d19b37aebec2248e8ec7' 
  AND token = 'a4OQvGm74ClegPc8BNNaRYCmG7PE2KHKWh2bSP6D5jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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