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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9499541a9508a56a77dd765dcd566e0715192345fedd9de0feb51d26c76400' 
  AND token = 'BnzvFChcTE5vRoPVVssO7POb20N/TJLZskymJ1BysM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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