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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918dcd3128f0fe5bfca8d6a08334a1ee1920cb685250f6e4c75465e9016b1859' 
  AND token = 'BTWO3aD1EJA5k89V6J0kB67aV507i6oGv9LrJImREsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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