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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db0bceb5e4d66c21ec77a44ceab1bf2c7fc6de0acb219ef7ed48908fe39eba7' 
  AND token = '7wx4/ZyizMW1iO55jo4BP+98ZjFMHtGDEFEEF8o8uss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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