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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374c94bbde5d882515bceb698251a5a7b0a88b5579613207f2875367463e4e69' 
  AND token = 'cvD84bePxbwHWJxs1YhY9jQ7E7ZOU3Q/wvALmt4DgYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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