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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b48366c59cbf2f3a6ecee16ad6b424fbf66b5c142782cd703d6cc3a4724e4ec' 
  AND token = '/71/QdlsBGcZzxSJL2fHEcNAkTYW66BQ1/G7ozaFXxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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