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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f029770c4c8b9a378e044f242500b73c74a1882f3dee616e0ad0500b4369136' 
  AND token = 'mSEvaWPk4lnYkCPKk+BVKlalYqHRy1lWO7TtAz8+Cok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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