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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce88ff1d6b7a386f70b4bee5b4d5cdbac62ce51f9b5d19961c69e62bc4d25503' 
  AND token = '9FrEJqzQuPNtS/14fQF1kFqksyziqCQSmXThvnae/DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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