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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27f7f76239580513ab497fb1c22f9629bdd9e0fe5114ed58f02c86260c1d4b2' 
  AND token = 'cJ7D3fJ2atrxzi2AA03EGbEqsQty4G5i7Jq0lPZi3v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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