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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be6a81137b754f0d9ec1ebf1edb07d6fca8ae5679e91f3116a08541b82341be' 
  AND token = 'p8FaHJJAL0W6K2bmorhaBce9yfg8NsQPILZ9932UhEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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