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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2528fd12d6c77a1921b4c1e40eef53f7851f26dc7984e97650ba9e087c5377' 
  AND token = 'LqxY/Ye7aedvaGSI/rL7sKALbMKLwck++m7MFUZ4FqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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