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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009ef7902f9914b21db0e21d697c9401a2b47304d03e9498f9841a69f3b654c1' 
  AND token = 'JamcLz/eYfFoUPvBclc17yAteGs3ObDRbMSYwcRw8qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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