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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cc3b9de74224e17e116cbdf89b38f1f175e94c84e0727ad21ec9a50a31d0dd' 
  AND token = 'UIqCg6sQwlhU0q/smOPf19LZjmYpSvbSVpPhHmb1E0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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