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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bec4687f7e2ac7a8a30dde534b180d9b0c447fb74e28871d5d4de51e1c12fce' 
  AND token = '0Rqd9Uho+9tbXFBLZ8fxKLZabRgA1alGf7ZRNk+GooY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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