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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465220e8e3deb74fc15a84c5ad5364eb0e9a9d3437b24b1f70757f3a3391bd41' 
  AND token = 'wO+4WvRe+mqyMiJiKgVhClFOOcL2pca+Dcxgpahn16s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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