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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc7856a2ade7b898dd4dc363874065fe9f9d1332d0bc06c651134d05c42751a' 
  AND token = 'A4U5VqD0AfopJ99Xk1z3O4ziPYw+PSWhDDgOajCbOnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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