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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b38fcb5f7c0b3b1e63363c1a6f3235e958e0fd8031a0c50ed42fe02aad064aa' 
  AND token = 'MykKO3RKrlCipY0VxL+fel6pTl/UVaEiX6Q0yiMfxXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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