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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be2a921692df2f33f4f053b1610198e11dd493a0dc5a1a523ac0001dbea6361' 
  AND token = '42NZ6HlPSPbt4ZS32e+6Lvr3EAR4cLZLPsEfooHdp5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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