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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcba4183b69f0260f4748977973ab8ce3d76668ef3a942e9a4b9dcdd359583fc' 
  AND token = 'dKonnoi6ak2hCzeAQ9/59trNrSIJ0VhwuSJig1gY3Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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