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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd457e98c1a95f1cdff431bec89df97efdf340a4239b2d783de1c931d692d86' 
  AND token = '9dflKBCcZzjy2mknSDyChWCMDakx7ABfNZQLaZ1pzYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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