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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69cf3280b84d0cc665862605fa4b82858b093e9b429721d1cd303889b4b229c' 
  AND token = 'LzgfkG54S5kmkPWuJz2n07Ue/fSxu5bTUiWUlo0SnQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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