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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2cf1b61d38303c773885ef1305cce4fe4f51c6bb01896d570b5cecea02fb4bc' 
  AND token = 'Bk3k7AkctVN9ei4gjgInE9EH2zSuToEQ4FFIFZfwy98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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