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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93549b4580b62a94c9578dafccbb397b40ffa178be005144b4dd6b56fa8c34b1' 
  AND token = 'J9Pwui759AjdPw8YYiZICIH5vf2IZR3AFAsQRI1SVKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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