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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1bf4ec6a003593e994dbf3ef6782a14adf546bc5bec78160a108c897f4ac92d' 
  AND token = '2gcyaJB0zbaFrcG+o3MMNzRg5vmZUirxYae+9brJ1tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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