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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ffe8923a88bae8dc0ce4097e7baef817cab894390ced81b2e192d37b206bb8' 
  AND token = '7kOTG+AQvRsi00eVVJHDja4ujxyY69w8Wkccnsr8fO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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