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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc27b512f614726a54fb023ea5662a63f21961b2759afbabfa5d3cecfc82be60' 
  AND token = 'LBZQM5v6AfbecVv/Dq8oyWfmGzEgPGem5syrJaTFpOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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