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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94790209e6218c831ab41f38756594983a71bd372ae106b20f1bb9ea7b0060c2' 
  AND token = 'ijoA3iRDiYNUJ8Uw5K6kNhi9H2UyRxd27zr/wnLqVRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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