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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9075f15c2efff507b1e25eed01e70253582f3c178239e2eb44086fb5251164d8' 
  AND token = 'DWPb+jv9BUk5WFxgiwYudTlqPH7xLL9uL4fkQsWLffo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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