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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2ad1fc18c2d5a17784aa3c989e35c3f94bb1af6e8d4d18e4058bbf24962fc0' 
  AND token = 'Xlf4l9JauXDdhhii0cVitOR98H92VQSoiuAVT8SFkak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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