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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c871940768fbb4a925468e2f02e0f51537de2ac423831248bd0299d49882f038' 
  AND token = 'yLc+e8brTbx3R4duRcfQtZ1itjvlVb/tBoZ/xm6hhKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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