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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f6cc9db777d1134b1bbda1847de5d8e61d81bf3dcef8dc3eeb2281c4d260c0' 
  AND token = 'Oe/rIVNnzCH+EdsukgYSurTN9zaXPEDJJ2F1Ce+6ZQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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