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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f39e877271a050d2c3b4c926928a51c04d8664b5293d4753a9e25206ede967c' 
  AND token = '91hltGn9gGU1sZK99KlefDBkJdGguPhD+OPJ13pTMfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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