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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56bc5a0fcabe5c90d4da9a0b60902b36599c259600fdb67a89eddc71f9b4c76' 
  AND token = '1/+LWA/DUZupQluJnUrSCa+XVFXaWBeJScGB7Gi7mzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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