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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a4e04c836140c266a4d585327e9188c1b7144c6e6b176abfd3f757db17008b' 
  AND token = '5I79H7OPTCKCCSOsXIBYwDrlx3eMhvW6vwzSrJaes/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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