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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f319933c2bc8241203e1d134e3f231cdc502c1d57eb2fd5ea75ecf2e101f1bdb' 
  AND token = 'Cv0r4Ihhf4PPS1o016BoEwHbqRy/6cGWZ/HX7sg5VpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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