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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8c9e4332a12ce8014c91f14837c35cb49f0fb362e6e210d6e591c2f4c3833c' 
  AND token = '0+5wrCCzkGMHr3Woe9gOjORsjdTHyT343ydpJYDGqh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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