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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6fed5e49db5a37a084b9a542484691c99afb5c8540c6abc9ea8ea8c67936f7' 
  AND token = '1qOfN/gPkQ77F+18NktljN7i2GptvcfItFT91ALU/qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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