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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ecd86ce031077f9e06bea8507e2e3f36b952651fe26f6ee12334afe4deb1f62' 
  AND token = 'pls3vU8SPz0MfzSaxUH9i5SdXeCwq/bTX41X9MD/0oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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