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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a495a18e3e34f0d195aecd7b1249af87eb0f478c55a1f06c1fb4e69573f82967' 
  AND token = 'MDeJftfxpkUagar9vJE7dWw7xyn1rxkO5w4vBxaj5bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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