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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bde2198790fe2d53539aa5bbe561d95f6b0ba93d24d0a0dcdb58569f4d38ab' 
  AND token = 'K8//s7Wcs7jkDtmqeKT0KCyCgg8oJhwNDCsFGNrHX90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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