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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5224cb7d885ca1af4d9aa3de3c507afcc6f97b9885175976f6a07e47f00b0a' 
  AND token = '5SbkoQYhsFSVorQ3oZt1qrXmVBvmYsxZVaMlFTPRBE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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