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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3929a710334709474b56e1765877f70a0faebc96e7cc07b18ca75c6e634f6a13' 
  AND token = 'eigywS+iOc1CaknuFjiQOy3twIrAfgFb543VUwM7t5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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