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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac9be41a7c7b51aba149d48f440eda30d528dd1ce4930dcf59ed19e676fc502' 
  AND token = '1jN6ZbB6B6DcVHtCpiKdFNEI6emMnbmLAc5T0ZMfh1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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