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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05fbcfbec17ac60317e84954d6d194e82eb27dce16d2539085af8d0d65dab73' 
  AND token = '1plekiDa3hl3yWyRO+fzLXvFOMHyqyvIelMqZrR7jyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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