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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea2c05c7ba667d2b1bf3bd6df103ece6e0c49c4618757112521383076dc9814' 
  AND token = 'o6Xs+ggF+30c/D59Js917geFk4T5zIFrJYSuBmYswII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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