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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6693a991d8eb1d1de60da3a2e774d517b34039676735236645e50a569b0189' 
  AND token = 'Nb5zTONA0cDTF1xErQrem0w4AxSu+9V1NDWFZVUIPLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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