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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4a9321295dfe072d16b642d315133c1b3799f3c88912681971c7a1ae26903b' 
  AND token = 'gJ3PTSIDbk2mMP7iEBlV97kjqPdP2qoweSuz+IDav38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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