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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1f27c1c75ac93885a863d5f8e7f92d17585f57e999f89a166ea8a027b9f822' 
  AND token = 'StTf0jC5cvnproRblfu5Fq9PUK1XwnbvbTq2INPfplw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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