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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8b42721de31ba8b2742426243fccdd4d09bcfc8a3e9d44e53396f55cdb9e32' 
  AND token = 'bxYHgeo1T4TjQJYwmpc3mLMe6deFHlMl1G4F8JbVC/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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