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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd051862b34897ae1d0b92d173cc443d0428e2a2a4cff09dcb43b5f8562330670' 
  AND token = 'bRbXK7T3484UBCEso/bfs4JFidGTceQRtErO7vqhqjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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