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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b548aaf45a206677d2852b72ff1440c67dab6c6c7f77d3e982a9c25f45cc5bf9' 
  AND token = '+EHHMwofvLmvuAcxblDVdE1Wup5J5G1JI6ovveLG5eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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