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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acdccdfda9404bc3382e84d5dd087472f86b031f1252a755e2225b788e523fde' 
  AND token = 'fa0A2Vy+tYqQjPab3BMmkuwspL7vpt5Q4ajvzkYWIe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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