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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada134d740df6deb2a0d10c8398641392ee4a82cb0a014ec0b0c97188b28f63a' 
  AND token = '09nVu1hjATenI82lBlOPlvdgE6/5ThNjhq9EZvmHOsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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